Issue 3112 - Split get_handler logic out into seperate function

sitescripts/web.py

 # coding: utf-8
 
 # This file is part of the Adblock Plus web scripts,
 # Copyright (C) 2006-2015 Eyeo GmbH
 #
 # Adblock Plus is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 3 as
 # published by the Free Software Foundation.
 #
 # Adblock Plus is distributed in the hope that it will be useful,
@@ skipping 79 matching lines @@
     raw_data = parse_qsl(environ['wsgi.input'].read(content_length))
     try:
       data = {k.decode('utf-8'): v.decode('utf-8') for k, v in raw_data}
     except UnicodeDecodeError:
       return send_simple_response(start_response, 400, 'Invalid form data encoding')
 
     return func(environ, start_response, data)
 
   return wrapper
 
+def get_handler(path):
+  """Returns the URL handler for the given path if avaliable, otherwise
+  throws a KeyError exception."""
+  try:
+    handler = handlers[path]
+  except KeyError:
+    handler = handlers[re.sub(r"[^/]+$", "", path)]
+  return handler
+
 def multiplex(environ, start_response):
   try:
-    path = environ["PATH_INFO"]
-    try:
-      handler = handlers[path]
-    except KeyError:
-      handler = handlers[re.sub(r"[^/]+$", "", path)]
+    handler = get_handler(environ["PATH_INFO"])
   except KeyError:
     start_response("404 Not Found", [("Content-Type", "text/plain")])
     return ["Not Found"]
 
   return handler(environ, start_response)
 
 for module in set(get_config().options("multiplexer")) - set(get_config().defaults()):
   module_path = get_config().get("multiplexer", module)
   if module_path:
     imp.load_source(module, module_path)
   else:
     importlib.import_module(module)